Coup Atlas Research Database
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80008261953ConspiracyMilitary coup

Thailand, 1953 — military coup conspiracy

Thailand (THA)Southeast Asia, AsiaAugust 26, 1953

Event Summary

The dataset records an event coded as a military and dissident coup conspiracy in Thailand on 26 August 1953, during the Phibun-Phao-Sarit triumvirate. In this period Field Marshal Phibunsongkhram's standing within the military was declining as a result of the plots against him, while his two junior partners, police director general Phao Siyanon and army commander Sarit Thanarat, grew steadily more powerful; Phibun retained the premiership largely because of their rivalry for the succession. The government's anti-communist campaign, launched with the November 1952 announcement of a communist plot, gathered momentum throughout 1953.

The coded August 1953 conspiracy fits this pattern of ongoing military and factional plotting against Phibun, bookended by the June 1951 Manhattan Rebellion, the November 1952 communist-plot arrests, and the eventual 1957 coup by Sarit that finally removed Phibun from power.

Researched Details

Researched

Independent research, added record by record. Hover any label for what it means.

Target identified in Coup Atlas research: Phibunsongkhram survived the factional plotting of this period but was overthrown by Sarit in 1957
RESEARCHED NAME
Key figures
Field Marshal Phibunsongkhram (prime minister of Thailand, target)
General Phao Siyanon and General Sarit Thanarat (rising rival partners)
Disaffected military and factional elements (plotters)

Sources

As time passed, Phibun's stock within the military declined as a result of the plots against him, and Phao and Sarit grew more powerful than Phibun.
SOURCE REVIEWED GlobalSecurity, November 1951 Coup open source ↗
Phibun retained the prime ministership only because of Phao and Sarit's rivalry for the succession.
SOURCE REVIEWED GlobalSecurity, November 1951 Coup open source ↗
Phibun survived attempted coups in 1948, 1949, and 1951, including the June 1951 Manhattan Rebellion by naval officers who took him hostage.
SOURCE REVIEWED EBSCO, Thai Military Coup open source ↗
Phibun's declining standing culminated in the September 1957 coup by Sarit Thanarat that removed him from power.
SOURCE REVIEWED EBSCO, Thai Military Coup open source ↗

Editorial Note

No discrete named plot precisely on 26 August 1953 was found in accessible English sources this session; the entry records the dataset's coding and the verified context of ongoing military and factional plotting against Phibun during the triumvirate, flagged as context. Bookended by the 1951 Manhattan Rebellion, the November 1952 communist-plot arrests, and the 1957 Sarit coup. Distinct from the 10 November 1952 Thailand record in this batch.

Cross-Reference

Only one dataset carries it. One of the three reference datasets we check against carries this event; the others do not list it. That is not a contradiction — the datasets cover different periods and use different thresholds — but it means the record has had less outside corroboration.

Identifiers for finding this same event in the other datasets:

Cline Center id
80008261953

How the match is made is described in crossref-report.md.

Outcome and Target

Coup Atlas research identifies the target as: Phibunsongkhram survived the factional plotting of this period but was overthrown by Sarit in 1957.

Baseline coding: Plot discovered and disrupted before execution. Recorded leader fate: remained in office; not physically harmed. The baseline file does not name individual targets; researched names are kept in a separate layer.

Baseline Dataset Citation

Cline Center Coup d’État Project Dataset, v2.2.2
Peyton, Buddy, Joseph Bajjalieh, Michael Martin, and Andrea Gerald. 2026. Cline Center Coup d’État Project Dataset. Cline Center for Advanced Social Research. V.2.2.2. February 17. University of Illinois Urbana-Champaign. doi: 10.13012/B2IDB-9651987_V10
⚑ This citation establishes the coded baseline record; use the claim-level sources above for the researched narrative.

Baseline Source-Document Entries

New York Times

“THAILAND HOLDS 11 As Red Plotters Former Officers, Government Officials Among Accused – Vietminh Hand Seen,” August 27, 1953

Washington Post

“Thailand arrests gun-runner as revolution plot leader,” August 29, 19533

This is the citation trail carried by the baseline dataset, grouped by outlet and rejoined from the line-wrapped original. Coup Atlas has not independently re-checked every document; read the original before citing a specific claim. URLs the import damaged beyond safe repair are shown as plain text and listed in citations-report.md. How this list is built →

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